The littoral zone of polar lakes: inshore–offshore contrasts in an ice-covered High Arctic lake
In ice-covered polar lakes, a narrow ice-free moat opens up in spring or early summer, and then persists at the edge of the lake until complete ice loss or refreezing. In this study, we analyzed the horizontal gradients in Ward Hunt Lake, located in the Canadian High Arctic, and addressed the hypoth...
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Canadian Science Publishing
2021
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ftdoajarticles:oai:doaj.org/article:1cbf399250b549db9f8e0e48a805b17f 2023-05-15T14:23:39+02:00 The littoral zone of polar lakes: inshore–offshore contrasts in an ice-covered High Arctic lake Paschale N. Bégin Milla Rautio Yukiko Tanabe Masaki Uchida Alexander I. Culley Warwick F. Vincent 2021-03-01T00:00:00Z https://doi.org/10.1139/as-2020-0026 https://doaj.org/article/1cbf399250b549db9f8e0e48a805b17f EN FR eng fre Canadian Science Publishing https://doi.org/10.1139/as-2020-0026 https://doaj.org/toc/2368-7460 doi:10.1139/as-2020-0026 2368-7460 https://doaj.org/article/1cbf399250b549db9f8e0e48a805b17f Arctic Science, Vol 7, Iss 1, Pp 158-181 (2021) lake zonation lake ice food webs microbial mats underwater light Environmental sciences GE1-350 Environmental engineering TA170-171 article 2021 ftdoajarticles https://doi.org/10.1139/as-2020-0026 2022-12-31T06:53:54Z In ice-covered polar lakes, a narrow ice-free moat opens up in spring or early summer, and then persists at the edge of the lake until complete ice loss or refreezing. In this study, we analyzed the horizontal gradients in Ward Hunt Lake, located in the Canadian High Arctic, and addressed the hypothesis that the transition from its nearshore open-water moat to offshore ice-covered waters is marked by discontinuous shifts in limnological properties. Consistent with this hypothesis, we observed an abrupt increase in below-ice concentrations of chlorophyll a beyond the ice margin, along with a sharp decrease in temperature and light availability and pronounced changes in benthic algal pigments and fatty acids. There were higher concentrations of rotifers and lower concentrations of viruses at the ice-free sampling sites, and contrasts in zooplankton fatty acid profiles that implied a greater importance of benthic phototrophs in their inshore diet. The observed patterns underscore the structuring role of ice cover in polar lakes. These ecosystems do not conform to the traditional definitions of littoral versus pelagic zones but instead may have distinct moat, ice-margin, and ice-covered zones. This zonation is likely to weaken with ongoing climate change. Article in Journal/Newspaper Arctic Arctic Climate change Zooplankton ice covered waters Directory of Open Access Journals: DOAJ Articles Arctic Arctic Lake ENVELOPE(-130.826,-130.826,57.231,57.231) Arctic Science 7 1 158 181 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English French |
topic |
lake zonation lake ice food webs microbial mats underwater light Environmental sciences GE1-350 Environmental engineering TA170-171 |
spellingShingle |
lake zonation lake ice food webs microbial mats underwater light Environmental sciences GE1-350 Environmental engineering TA170-171 Paschale N. Bégin Milla Rautio Yukiko Tanabe Masaki Uchida Alexander I. Culley Warwick F. Vincent The littoral zone of polar lakes: inshore–offshore contrasts in an ice-covered High Arctic lake |
topic_facet |
lake zonation lake ice food webs microbial mats underwater light Environmental sciences GE1-350 Environmental engineering TA170-171 |
description |
In ice-covered polar lakes, a narrow ice-free moat opens up in spring or early summer, and then persists at the edge of the lake until complete ice loss or refreezing. In this study, we analyzed the horizontal gradients in Ward Hunt Lake, located in the Canadian High Arctic, and addressed the hypothesis that the transition from its nearshore open-water moat to offshore ice-covered waters is marked by discontinuous shifts in limnological properties. Consistent with this hypothesis, we observed an abrupt increase in below-ice concentrations of chlorophyll a beyond the ice margin, along with a sharp decrease in temperature and light availability and pronounced changes in benthic algal pigments and fatty acids. There were higher concentrations of rotifers and lower concentrations of viruses at the ice-free sampling sites, and contrasts in zooplankton fatty acid profiles that implied a greater importance of benthic phototrophs in their inshore diet. The observed patterns underscore the structuring role of ice cover in polar lakes. These ecosystems do not conform to the traditional definitions of littoral versus pelagic zones but instead may have distinct moat, ice-margin, and ice-covered zones. This zonation is likely to weaken with ongoing climate change. |
format |
Article in Journal/Newspaper |
author |
Paschale N. Bégin Milla Rautio Yukiko Tanabe Masaki Uchida Alexander I. Culley Warwick F. Vincent |
author_facet |
Paschale N. Bégin Milla Rautio Yukiko Tanabe Masaki Uchida Alexander I. Culley Warwick F. Vincent |
author_sort |
Paschale N. Bégin |
title |
The littoral zone of polar lakes: inshore–offshore contrasts in an ice-covered High Arctic lake |
title_short |
The littoral zone of polar lakes: inshore–offshore contrasts in an ice-covered High Arctic lake |
title_full |
The littoral zone of polar lakes: inshore–offshore contrasts in an ice-covered High Arctic lake |
title_fullStr |
The littoral zone of polar lakes: inshore–offshore contrasts in an ice-covered High Arctic lake |
title_full_unstemmed |
The littoral zone of polar lakes: inshore–offshore contrasts in an ice-covered High Arctic lake |
title_sort |
littoral zone of polar lakes: inshore–offshore contrasts in an ice-covered high arctic lake |
publisher |
Canadian Science Publishing |
publishDate |
2021 |
url |
https://doi.org/10.1139/as-2020-0026 https://doaj.org/article/1cbf399250b549db9f8e0e48a805b17f |
long_lat |
ENVELOPE(-130.826,-130.826,57.231,57.231) |
geographic |
Arctic Arctic Lake |
geographic_facet |
Arctic Arctic Lake |
genre |
Arctic Arctic Climate change Zooplankton ice covered waters |
genre_facet |
Arctic Arctic Climate change Zooplankton ice covered waters |
op_source |
Arctic Science, Vol 7, Iss 1, Pp 158-181 (2021) |
op_relation |
https://doi.org/10.1139/as-2020-0026 https://doaj.org/toc/2368-7460 doi:10.1139/as-2020-0026 2368-7460 https://doaj.org/article/1cbf399250b549db9f8e0e48a805b17f |
op_doi |
https://doi.org/10.1139/as-2020-0026 |
container_title |
Arctic Science |
container_volume |
7 |
container_issue |
1 |
container_start_page |
158 |
op_container_end_page |
181 |
_version_ |
1766296143265792000 |